Improvement in extension ladders



tait-ed lteres NATHANIEL PULLMAN, .0F NEW OREGON, IOWA.

Letters Paten/t No. 105,126, dated July 5,1870.

IMPROVEMENT IN EXTENSION LADDERS.

The Schedule referred to in these Letters Patent and making part 0f TheSame To all whom fit may concern Be it known that I, NATHANIEL PULLMAN,of New Oregon, in the countyof Howard and State of Iowa, have 'inventeda new and useful Improvement in Ladder; and I do hereby declare that thefollowing is a full and exact description of the same, reference beinghad to the accompanying drawing, and to the letters of reference markedthereon.

This invention has for its object the production `of an improvedextension ladder, especially designed for painting or fruit-pickingpurposes, and consists mainly in certain details of construction whichwill be fully described hereinafter.

In the drawing- Figure lrepresents a perspective view of my improvedladder, and

Figures 2 and 3, sectional views of .parts detached.

To enable others skilled in the art to make and, use my invention, Iwill now. proceed to describe fully its construction and method ofoperation.

A and B represent two ladders which are united at the top by means ofany suitable fastenings. Y

I preferably employ arms a a, which are rigidly -attached tothe ladderA, and extend far enough from it to receive the bolt c, which passesthrough suitable orifices therein, and also through the 'upper ends ofthe ladder B, as clearly shown in the drawing.

The ladder A is provided with steps, while the ladder B is provided withrounds.

(l represents a chain, by means of which the spreading of the ladders atthe bottom is regulated.

'lo stear y the ladders and secure them against lateral movement, astay-rod, e, may be used, if desired, which, being provided with a hookat its upper end, may be caught into an eye attached to one of theladders, as shown.

F liepresents an additional ladder, which is used for extensionpurposes. It is secured to the ladder B in such manner that it mayreadily be adjusted vertically, and yet is firmly held from accidentaldisplacement.

To secure these results, I employ guides b b, which consist of suitablepieces of metal rigidly attached at one of their ends to the sides ofthe ladder B at its upper end, and having their other ends bent over theladder F, as shown. These guides securely prevent the ladder F frombecoming accidentally disconnected from the ladder B, and yet do notinterfere with its vertical adjustment.

For the purpose -of securing the ladder F in any desired position uponthc ladder B, I provide the weighted hooksff; these are pivoted iu thesides ,of the ladder at its lower end, in such manner that, when thelatter stands vertically, or nearly so, the hooks are in position torest upon one of the. rounds of the ladder B.

Their shape and location is such, also, that if the ladder F be pushedupward upon the ladder B, the hooks will be depressed upon coming intocontact with each round, (their points passing into suitable sockets inthe Lladder,) and thus be enabled to slip freely over it.

As soon, however, as the round is passed, the hooks are broughtimmediately, by means of the weighted ends, into position to catch uponit, and, by simply freeing the ladder from the grasp, it will fall atonce into position and be securely held.

To lower the ladder, it is necessary first to raise the laddersufficiently to free the hoolr's from the rounds upon which they arecaught, and then to raise the weighted ends of the hooks with the hand.

By these meansA the points of the hooks will be turned down into theirsockets, and the ladder' may, consequently, be lowered.

To enable. the ladderF to be easily moved, I place Y upon the bolt c acylinder or hollow roller, c', which freely revolves as the ladder movesover it.

It will be readily perceived that the ladder F may be removed entirelyfrom the ladder B, when desired, without taking the ladders down, byhaving ladder FA six inches shorter than ladder B, and drawing theformer out from under the'fguides b.

G represents a removable platform, provided with the arms q y, which,when in place, is held by its arms-,n

which engage with the pins of the ladder F, as shown.

The operation will be readilyunderstood. The ladders A and B areemployed in the usual well-known manner. The ladder F is raised orlowered upon the ladder B as .necessity may require, being securely heldin any position by means of the devices described. v

Having thus fully described my invention,

What I claim as new,- and desire to secure by Letters Patent, is-

1. The removable platform G, when constructed with the hooksg, and used.in connection with the ladder F, having the pins fff, for the purposeset orth. 2. The ladders A and B, guides b b, bolt c, with` rollers c',ladder F with hooks f f, and removable platform G,when combinedandrarrauged as described, for the purpose set forth. v

This specification signed and witnessed thislth day of March, 1870. i

Witnesses: NATHANIEL PULLMAN.

HENRY K. AvEnrnL, WILLIAM GAnnn'rr.

f'f upon the upper end

